77908078357 has 2 divisors, whose sum is σ = 77908078358. Its totient is φ = 77908078356.

The previous prime is 77908078333. The next prime is 77908078387. The reversal of 77908078357 is 75387080977.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55049359876 + 22858718481 = 234626^2 + 151191^2 .

It is a cyclic number.

It is not a de Polignac number, because 77908078357 - 2⁷ = 77908078229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77908078295 and 77908078304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77908078307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38954039178 + 38954039179.

It is an arithmetic number, because the mean of its divisors is an integer number (38954039179).

Almost surely, 2^77908078357 is an apocalyptic number.

It is an amenable number.

77908078357 is a deficient number, since it is larger than the sum of its proper divisors (1).

77908078357 is an equidigital number, since it uses as much as digits as its factorization.

77908078357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20744640, while the sum is 61.

The spelling of 77908078357 in words is "seventy-seven billion, nine hundred eight million, seventy-eight thousand, three hundred fifty-seven".